Nexperia USA Inc. 74LVC1G123DP,125

Overview

74LVC1G123DP,125 from Nexperia is a single retriggerable monostable multivibrator with Schmitt trigger inputs, used for precise pulse generation and timing extension in digital control circuits. It supports 1.65 V to 5.5 V supply, delivers ±24 mA output drive at 3.0 V, and operates across –40 °C to +125 °C. Its dual-edge triggering (A: negative-edge, B: positive-edge), direct reset (CLR), and external REXT/CEXT programmability enable flexible one-shot timing in power management and interface synchronization.

For engineers reviewing the 74LVC1G123DP,125 datasheet, 74LVC1G123DP,125 pinout, 74LVC1G123DP,125 application, or 74LVC1G123DP,125 equivalent, key selection considerations include retriggerable pulse width control, IOFF power-down protection, Schmitt-trigger noise immunity, and TSSOP8 package compatibility with mixed-voltage 3.3 V/5 V systems.

Technical Context

The device implements a CMOS-based retriggerable monostable architecture where output pulse width is set by external REXT and CEXT components and dynamically extended via A (↓) or B (↑) retriggering. Pulse termination is achieved through a LOW-going edge on CLR, which also inhibits new triggers.

Schmitt-trigger inputs provide hysteresis (e.g., 40–363 mV depending on VCC), enabling robust operation with slow-rising signals. The IOFF circuit disables outputs during partial power-down, preventing backflow current when VCC = 0 V - critical for hot-swap and multi-rail system designs.

Key Specifications

Pinout & Package

TSSOP8 plastic thin shrink small outline package (SOT505-2); 8 leads; body width 3 mm; lead length 0.5 mm; pin 1 indicator located below marking code Y3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar monostable multivibrator applications.

Compared with SN74LVC1G123DBVR and 74AUP1G123GW,125, the 74LVC1G123DP,125 uniquely combines TSSOP8 thermal performance, full 5.5 V input tolerance, independent CEXT/REXT nodes for accurate timing, and industrial temperature grade - making it optimal for mixed-voltage, high-reliability embedded timing.

Availability

74LVC1G123DP,125 is available at Aetrix Electronics and suitable for motor control timing, power sequencing, industrial sensor interface, and automotive body control requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74LVC1G123DP,125 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in automotive, industrial, and consumer electronics.

The 74LVC1G123 belongs to Nexperia's LVC logic family - designed for low-voltage, high-speed operation with robust noise immunity and power-down safety features in space-constrained applications.

FAQ

What is the minimum external capacitor value supported for stable pulse width generation?

The datasheet specifies stable operation down to CEXT = 10 pF with REXT = 5 kΩ at VCC ≥ 3.0 V. Below 10 pF, parasitic capacitance dominates, causing timing inaccuracy. For reliable sub-microsecond pulses, use CEXT ≥ 100 pF and REXT ≥ 1 kΩ per Figure 12 and Table 9.

Can the 74LVC1G123DP,125 be used with a 1.8 V supply and 5 V input signals?

Yes - inputs tolerate up to 5.5 V independent of VCC, allowing direct connection to 5 V microcontrollers while operating at 1.8 V. Output VOH reaches VCC − 0.1 V (min), so at 1.8 V supply, it drives 1.7 V HIGH - compatible with 1.8 V LVC receivers but not 1.2 V systems.

How does the retrigger time (trtrig) vary with supply voltage and external components?

trtrig decreases with higher VCC and smaller CEXT: at VCC = 5.0 V and CEXT = 10 pF, trtrig ≈ 8 μs (typical); at VCC = 1.8 V and CEXT = 0.1 μF, it exceeds 14 ms. Figure 15 shows inverse relationship - design must ensure retrigger intervals exceed trtrig for reliable pulse extension.

Is the CLR pin functional as both reset and trigger input simultaneously?

Yes - a LOW-going edge on CLR terminates the output pulse immediately, while a HIGH-going edge triggers a new pulse due to internal connection from CLR to input gates. This dual function enables compact watchdog or event-synchronization circuits without external logic.